Number 1 is the only value possible in cell (5,1).

Number 6 is the only value possible in cell (7,3).

Number 9 is the only value possible in cell (1,3).

Number 4 is the only value possible in cell (2,3).

For row 2, number 9 is only possible in cell (6,2)

For row 5, number 9 is only possible in cell (5,5)

For row 4, number 6 is only possible in cell (4,4)

For box 6, Number 7 is only possible in cell (9,4)

For column 6, Number 7 is only possible in cell (6,5)

For row 2, number 1 is only possible in cell (3,2)

For row 7, number 1 is only possible in cell (8,7)

For row 5, number 1 is only possible in cell (4,5)

For row 6, number 1 is only possible in cell (7,6)

For row 8, number 1 is only possible in cell (6,8)

For column 9, Number 5 is only possible in cell (9,2)

For column 6, Number 4 is only possible in cell (6,6)

For box 8, candidates for 3 are all in row 9, so you can remove candidates from other blocks.

For box 6, candidates for 2 are all in column 8, so you can remove candidates from other blocks.

Naked Pair for 2 and 3, can remove these as candidates from other cells.

For row 8, number 3 is only possible in cell (8,8)

For box 9, candidates for 2 are all in column 9, so you can remove candidates from other blocks.

Naked Pair for 4 and 8, can remove these as candidates from other cells.

Hidden Pair for 2 and 3, can remove other candidates from these cells.

For row 4, number 8 is only possible in cell (5,4)

Number 2 is the only value possible in cell (4,6).

Number 3 is the only value possible in cell (6,4).

Number 2 is the only value possible in cell (3,4).

Number 3 is the only value possible in cell (3,1).

Number 2 is the only value possible in cell (7,1).

Number 3 is the only value possible in cell (7,2).

Number 5 is the only value possible in cell (8,4).

Number 5 is the only value possible in cell (2,5).

Number 2 is the only value possible in cell (8,5).

Number 8 is the only value possible in cell (2,6).

Number 3 is the only value possible in cell (1,6).

Number 5 is the only value possible in cell (5,6).

Number 8 is the only value possible in cell (4,8).

Number 9 is the only value possible in cell (3,8).

Number 7 is the only value possible in cell (7,8).

Number 6 is the only value possible in cell (2,8).

Number 7 is the only value possible in cell (2,1).

Number 4 is the only value possible in cell (4,1).

Number 8 is the only value possible in cell (9,1).

Number 6 is the only value possible in cell (1,1).

Number 8 is the only value possible in cell (1,2).

Number 2 is the only value possible in cell (2,2).

Number 7 is the only value possible in cell (4,2).

Number 4 is the only value possible in cell (8,2).

Number 4 is the only value possible in cell (9,7).

Number 8 is the only value possible in cell (3,7).

Number 5 is the only value possible in cell (1,8).

Number 2 is the only value possible in cell (9,8).

Number 7 is the only value possible in cell (1,9).

Number 4 is the only value possible in cell (3,9).

Number 3 is the only value possible in cell (5,9).

Number 2 is the only value possible in cell (6,9).

Number 9 is the only value possible in cell (7,9).

Number 8 is the only value possible in cell (8,9).

Number 6 is the only value possible in cell (9,9).